Alloy



permitting it to I plisliinent of the Patented Dec. 31, 1929 UNITED STATES PATENT, OFFICE JOHN V. 50. BALM, OF CLEVELAND fiEIGHT S, OHIO, ASSIGNOR TO THE CLEVELAND GRAPHITE BRONZE COMPANY,-OI CLEVELAND, OHIO, A CORPORATION OF OHIO ALLOY lt'o Drawing.

lhe present invention relating, as indicated, to alloys is particularly directed to a lead babbitt composition having properties and physical characteristics comparable to that of standard babbitt, but costing considerable less to manufacture. A further object of the invention is the provision of'a lead babbitt composition having high ductility be worked by rolling and otherwise for the purpose of applying it to other metal articles as a surface bearing material, or to be rolled and formed intobearings and similar articles. To the accomforegoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The following description sets forth in detail one approved combination of ingredients and method of making same embodying my invention, such disclosed ingredients'and procedure constituting, however, but one of various forms in which the principle of the invention may be used.

My improved composition consists of lead in a predominating amount with smaller amounts of copper, tin, mercury and anti-. mony. In a preferred embodiment of the invention I employ lead in an amount equal to 70 to 7 5 per cent of the total composition, copper to the extent of 5 or 6 per cent, tin about 12 per cent, mercury about 4 per cent and antimony from4 to 8 per cent. If a higher ductility is required the amount of antimony is reduced. The above composition is entirely comparable in its physical properties toa standard babbitt and is approximately 50 per cent cheaper to manufacture. It is of course to be understood that the" specific proportion of ingredients referred to above may be varied within a. reasonable range without departing from the spirit of this invention. It also possesses. the important property of not obtaining its full tensile strength and hardness for approximately 24 hours after casting, and it is possible that there is some amalgamating action occurring during this period by reason of the mercury content, which acts to reduce the size ofthe crystals and gives the same effect as .in cast- A iplication filed September 30, 1926. Serial No- 138,812.

ing an ordinary babbitt against a cold mold.

In my present composition I first mix copper and tin and to this molten composition add the antimony and subsequently the mercury and lead. For convenience the copper and tin are ordinarily alloyed first, as are the mercury and the lead.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the process herein disclosed or the materials employed in carrying out the process, provided the ingredient or ingredients stated by any of the following claims or the equivalent of such ingredient or ingredients be employed.

I therefore particularly point out and distipctly claim as my invention 1. A bearing alloy consisting of'70 to 75 per cent of lead, approximately 5 per cent copper, 12 per cent tin, 4 per cent mercury and 4 to 8 per cent of antimony.

2. An alloy consisting of 7 O to 75 per cent of lead, 5 to 6 per cent of copper, antimony 4 to 8 per cent, mercury approximately 4 per cent and the balance of tin.

Signed by me, this 28th day of September, 

